Liquid screening apparatus



July 20, 1943. -w.'. MOOR 2,324,637

' LIQUID scREEunie APPARATUS Filed Oct. 4. 1939 a Sheets-Sheet 1 f/v vfA/roe' WILLIAM C M0012,-

July 20, 1943. w. c. MOOR LIQUID SCREENING APPARATUS s Sheets-Sheet 2 Filed Oct. 4. 19:59

f/VI/ENTOE WILLIAM C. M0012.

July 20, 1943. 'w. c. MOOR I LIQUID SCREENING APPARATUS 3 Sheets-Sheet 3 Filed Oct. 4. 1939 Patented July 20, 1943 LIQUID SCREENING APPARATUS William O. Mdor, Fort Worth, Tex., assignor to The Jefirey Manufacturing Company; a corporation of Ohio Ap'plication October 4', 1939, Serial Ne. 297.905

13 Claims.

This invention relates to liquid screening apparatus and particularly to apparatus for removing solids from liquids, illustrations of which are the separation of sewage solids from the liquid as well as the separation of solids fouhd in liquids from slaughter-house and industrial wastes.

An object of the invention, therefore, is to produce screening apparatus of the above inerltion'e'd type which is very efficient in operation, yet simple of construction.

Another object of the invention is to provide an improved rotary disk screen structure.

Still another object of the invention is to provide liquid treating apparatus including a special conveyor for removing solids from liquids with a minimum of liquid carry-over.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawings,

Fig. 1 is a plan View of the apparatus compris ing my invention;

Fig. 2 is a sectional elevational View substantially along the center line thereof;

Fig. 3 is a diagrammatic side elevational View of the apparatus;

Fig. 4 is a sectional elevational and end view taken on the line 4-4 of Fig. 1 looking in the di+ rection of the arrows;

Fig. 5 isan enlarged sectional view showing a detail of the disk screen; and,

.Fig. 6 is anenlarged side elevation of the disharcel end of the influent sluice.

Referring to the accompanying drawings, it. will be seen that I-have provided a receptacle or tank In is in the form of a concrete pit, though it may be made of othe'r material, such as cast iron or steel, which pit is adapted to receive the liquid from which the solids are to be re-' moved, such as sewage, slaughter-house waste orindustrial waste, the normal liquid level in said tank i0 being indicated by the line I l in Fig.- 2.

Forming a part of said tank In is an eflluent sluice t2 by which the cleaned water flows from said tank In in the direction of the arrow indicated in Fig. 1 ofthe drawings The normal water level of the liquid in the sluice I2 is indicated by the line 13 in- Fig. 2 of the drawings which is of course below the Water level II due to a loss of head as hereinafter d'escribed.- The water permitted to flow into the effluent sluice I2 is screened by a substantially vertical rotary disk screen 14 which is effective to remove the solids which are delivered to the tank H] as hereinafter described.

The screen It comprises a frame [whic may, for example, be made in the form of four similar castings which are bolted together. Said frame I5 isbolted to walls of the sluice l2 adjacent air opening 16 provided in' one face thereof by means of anchor bolts l1. 7 h

The frame l5 provides a cylindrical opening IQ and at its outer edge has a finished or'machined face l9 for a purpose hereinafter described. Said screeii l4 also includes ar'dto'r comprising a frarrie 20 having a hub kye'd to a shaft 2| and having a press fit therewith.

Shaft 2| is joll'rhald iii jollfn'all b arings 23 arid 24 mounted on the Walls of the sluice l2 and the tank If], respectively, the former of wmc'rrco operates with adjustable sonar 22 to provide thrust bearing providing for adjustment of the position of frame 20 relative to frame l5; Ad

jacent one end shaft 2| carries a' drive sprocket 25 driven through chain and sprocket drive mechanism 26 from a variable speed electric inotor Z'I and a speed reducer 28. The afdredescribed thrust bearirig holds shaft 21 against axial movement in one direction, and axial mava ment' thereof in the other direction is prevented by collar 29. M v I The rotor frame 20 is provided with a finished or machined peripheral face 30 which is oppsite the aforementioned face l9 and cooperates there: with to forr'na seal between the rotor frame 20 and the stationary frame l5. While this seal will not normally prevent all flow of liquid into the sluice [2, it is preferably such that no tarticlescan flow into said sluice ll which could not flow through the screen as hereinafter described.

has been found in practice to be preferred; It

is of course evident that the rotary disksc'reen M will be operative to separate solid material.

above a predeterminedgsize-which reaches it; per mitting only the liquid and small particles of solids to flow into the eflluent sluice l2. This of course will produce a loss of head which accounts for the difierence in Water levels indicated by.

the lines II and I3.

To keep the screen cloth 3| from blinding or becoming stopped-up, I provide lower sprays 35 and upper sprays 36 which are situated on the effluent side of the screen l4 and at a position to sprayv steam, air or water over large areas of the screen cloth 3| after said screen cloth has emerged from the liquid in the tank l9. These sprays 35 and 36 are effective to remove solids and grease from the screen cloth 3| or the perforated screen plate.

An important feature of my invention is theconstruction and arrangement of the influent sluice by which the liquid bearing the solids is delivered to the tank l and to the screen M. This sluice is in the form of a trough 31 which in general is made of concrete as a part of the tank It! and sluice l2. The discharge portion of said sluice 31, however, is made of metal comprising two fixed side walls or plates 38, 38 and two adjustable side walls or plates 38, 38 and a bottom wall or plate comprising two sections 39, 39'. These side walls 38, 38 are each longitudinally adjustable toward and from the screen M by virtue of elongated slots 69, 69 therein through which bolts 6|, 6| extend. This provides for an adjustable clearance between the front edges of side walls 38', 38 of the sluice 31 and the adjacent face of the screen l4.

The discharge portion of the sluice 37 being made of metal, also includes the stationary bottom plate 62 to which is hinged at 49 the transverse plate 39. The bottom plate section 39' rests on top of the section 39 as shown in Figs. 2 and 6 and is longitudinally adjustable toward and from the screen I 4 by virtue of elongated slots 65 in the plate 39 and bolts 64 which extend through perforations in the plate 39 and through the slots 65 in the plate 39.

Furthermore, to permit a free discharge of any unusually large material into the tank In, the bottom plate 39, 39' is pivoted at 40 and is spring biased by spring means 4| to the normal position as illustrated in Fig. 2 of the drawings. Such spring means may be connected between the side plates 38, 38 and the ends of the bar 63 which is secured to the bottom of the plate 39.

It may be noted that the direction of rotation of the rotor frame 20 is clock-wise as illustrated by the arrow in Fig. 4 of the drawings. Consequently, if a large particle of material becomes lodged between the screen cloth 3| and the discharge edge of bottom plate or wall 39, 39', the rotation of the rotor frame 29 will carry this particle downwardly into the tank ||l while the plate 39, 39' swings to permit its discharge thereinto.

It is further of importance to notice the position and extent of the sluiceway 37 with respect to the screen I4. In the first place, it is to be noted that the lateral extent of the sluice 31 is between the shaft 2| and the peripheral portion of rotor frame 20.

Furthermore, there is an area of the screen cloth 3| which is radially beyond the outermost radial area of the sluice 31. This insures that the outer portion thereof will be clean when it dips below the liquid in tank l9 thereby insuring screening thereof, and in addition any liquid flowing through the sluice 31 will be discharged due to its velocity directly onto an area of the screen I4 which is covered by a screen cloth 3|.

Furthermore, the direction of rotation of the rotor frame 20 is such that after the influent liquid strikes the screen cloth 3| substantially at right angles to its plane, the screen cloth moves downwardly into the liquid in receptacle or tank i9 after which it moves out of the liquid and is cleaned by the lower and upper sprays 35 and 36, respectively.

It is to be particularly noted that full advantage is taken of the velocity of the influent liquid to effect a passage of the liquid through the screen cloth 3|. It may be noted that the normal water level in the sluice 31 is indicated by the line 42.

- As clearly illustrated by reference particularly to Fig. l of the drawings, the side walls of the receptacle or tank I0 converge so that settling solids will settle along a bottom which is in the form of an endless scraper conveyor 43 of special design for removing the settled solids with a minimum of liquid. The conveyor 43 comprises a trough having a material supporting bottom plate 44 and upwardly extending side plates 45 over which is adapted to move an endless conveyor mechanism comprising a pair of endless chains 46 which travel adjacent the side plates 45 and which are driven from head sprockets, one of which is diagrammatically illustrated at 41 in Fig. 3 of the drawings, which sprockets are keyed to head shaft 49 driven by an electric motor 49 through an appropriate drive mechanism 50, such as a chain and sprocket drive mechanism.

Adjacent the bottom of the conveyor 43 is a U-shaped guide 5| for each of the endless chains 46 which eliminates the necessity of tail sprockets and a tail shaft within the tank Hi. It is of course evident that the conveyor 43 extends upwardly in a sloping manner in the tank I so that any solid material that settles on the bottom plate 44 will be conveyed upwardly by flights 52 which extend between the endless chains 46, the solid material thus removed from the tank l0 being discharged over the head shaft 48 onto a belt or screw conveyor 53 or any other receptaole. The flights 52 are preferably perforated as illustrated in Fig. 1 of the drawings to permit free flow of liquid through them thereby draining the solids of liquid as they are conveyed above the water level II in tank In.

Furthermore, the bottom plate 44 is preferably perforated above the water level II as illustrated at 54 in Fig. 2 of the drawings to aid in this dewatering of the removed solids. 1

Still further, a pivoted top plate 55 is provided above the perforated portion 54 of bottom plate 44 which acts to squeeze or compress the solid material after it leaves the water in container Hi to aid in this dewatering process. noted that the bottom edge of the plate 55 is tapered as illustrated at 56 and this bottom edge is preferably slightly below the normal water level II in tank ID. This keeps material from falling off the flights 52 as they ascend above the water level The floating scum is free to float along the passageway indicated by the line of the arrow 51 (see Fig. 1) along which it is effectively propelled by the clockwise rotation of rotor 20 over weir 58 formed at an elevation below the liquid level between a wall of tank Ill and eilluent flume i2. Said scum is conveyed from the tank ill by the conveyor 43 along with the solids which settle in the bottom of said tank I9. At intervals it may be raked by a hand-operated scum rake into the path of the flights 52 of conveyor 43, while the top plate 55 is elevated, as by a chain 59.

In the operation of the device the sewage or waste liquid flows by way of influent sluice 31, the velocity of which is utilized to direct it It is to be against the rotating frame 20 of rotary disk screen 14 which screens liquid permitting only a clean liquid and solid material of relatively small size to flow into the effluent sluice I2.

The screen rotor 20 is rotated at an adjustable speed by the motor 2''! and drive mechanism. operative thereby. The screen cloth 3i of the perforated plate is continually cleaned by the sprays 35 and 36 thereby insuring an efficient screening action at all times. Solids which cannot pass through the screen cloth 3| settle on the bottom plate 44 of the conveyor 43 and are removed while they are simultaneously dewatered and delivered to any desired receptacle, such as conveyor 53.

It is thus evident that a simple but highly efficient screening apparatus for screeningsewage or slaughter-house or industrial wastes has been provided.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and I therefore wish not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

1. In screening apparatus, the combination with a sedimentation tank, of a sluice for directing influent into the upper portion of said tank, an eiiluent sluice in the upper portion of said tank having a closed end therein and being in position to be partially immersed in the liquid therein and having an opening through which liquid from said influent sluice flows theheto, a rotary screen positioned across said opening in said ellluent sluice located adjacent said influent sluice and, mechanism supporting said rotary screen with its lower portion immersed in theliquid from said influent sluice flows thereto, non-immersed portion adjacent the outlet from said influent sluice, and means for rotating said screen while permitting the liquid and finer solids to pass through the same from said influent sluice into said eilluent sluice, the screen being constructed and arranged to act as a baffle to deflect the larger solids into said sedimentation tank.

2. In screening apparatus, the combination with an effluent sluice, of a rotary screen extending across an opening in one side of said efliuent sluice, an infiuent sluice with its outlet at one side of the center of rotation of said rotary screen, and means for rotating said screen downwardly past said outlet while the influent and finer particles of material pass through the screen into said effluent sluice, the screen being constructed and arranged to act as a baffle to defleet downwardly below said outlet the larger particles of material.

3. In screening apparatus, the combination with a sedimentation tank, of an effluent sluice having a closed end projecting into said tank but spaced from the adjacent inner wall thereof, a rotary screen extending across an opening in one side of said eflluent sluice and acting as a baiile to large particles of material incapable of passing therethrough, mechanism supporting said rotary screen for immersion of its lower portion in the liquid in said sedimentation tank, a sluice for directing infiuent to said screen, and means including said screen, to produce a current of the surface liquid in said tank to flow unscreenable floating material around the closed end of said effluent sluice.

4. In screening apparatus, the combination with a sedimentation tank, of an efliuent sluice having a closed end projecting into said tank, a weir spanning the space between the inner end of said sluice and the adjacent inner wall of said tank, a rotary screen extending across an opening in one side of said efiluent sluice and acting as a bafile to large particles ofmaterial incapable of passing therethrough, mechanism supporting said rotary screen for immersion of its lower portion in the liquid in said sedimentation tank, a sluice for directing influent against one side of said screen for flow therethrough into said effluent sluice, and means, including said screen, to produce a current of the surface liquid in said tankto flow unscreenable floating material over said weir.

5. In liquid screening apparatus, the combination with a substantially vertical rotary disc screen, of an influent liquid conveying flume at substantially right angles to said screen, and an extension from said flume toward the adjacent face of screen adjustable to vary the spacing between the outlet from said extension and, said screen face.

6. In screening apparatus, the combination with a rotary screen, of a sluice leading thereto but spaced therefrom, an adjustable extension from said sluice toward said screen, said sluice having a downwardly swingable spring biased bottom plate at said extension operable to permit discharge of relatively large pieces of material flowing from said sluice, and means for rotating said screen in a direction to swing such bottom plate downwardly when such relatively large pieces of material are being discharged from "i. said sluice and are in contact with said screen.

'7. In liquid treating apparatus, the combination with a receptacle for liquid having solids in suspension, of a trough having a perforated bottom, conveyor means movable over the perforated bottom of said trough, and means comprising a cover plate for squeezing material as it moves under said plate and out from the liquid in said receptacle to reduce its liquid content.

8. In liquid treating apparatus, the combination with a sedimentation tank, of conveyor mechanism for removing settled solids from the liquid in said tank, and means comprising a cove plate for squeezing material as it is moved under said plate and out from the liquid in the tank to reduce its liquid content.

9. In liquid treating apparatus, the combination with a sedimentation tank, of conveyor mechanism for removing sediment from the tank, and means comprising an upwardly yieldable cover platefor squeezing material as it is moved under the plate and out from the liquid in the tank to reduce the liquid content of such material.

10. In liquid treating apparatus, the combination with a sedimentation tank, of a trough having a perforated bottom extending upwardly out of the liquid in said tank, an endless conveyor means including perforated flights movable along said perforated bottom, and means comprising a pivotedcover plate for squeezing material as it moves under said plate and out of the liquid in said tankto reduce its liquid content.

11. In screening apparatus, the combination with a screen, of a sluice leading thereto having its discharge edges close to but slightly spaced from said screen, said sluice having a downwardly swingable spring biased bottom plate operable to permit discharge of large particles between said screen and sluice edge, and means for rotating said screen in a direction to swing said bottom plate downwardly in case a large particle becomes lodged between the screen and swingable bottom plate.

12. In screening apparatus, the combination with a substantially vertical rotary disk screen, of means for rotating said screen on a substantially horizontal axis, a liquid receptacle into which the lower part of said screen projects below the liquid level, an efiluent sluice leading from said receptacle from which liquid flows after passing through said screen, an infiuent sluice positioned to deliver flowing liquid having suspended solids therein substantially at right angles to the plane of said screen and directly onto it, said influent sluice extending laterally between the axis of rotation of said screen and the periphery thereof, means on the opposite side of said screen from said influent sluice for flowing adhering solids from a portion of the screen while out of the liquid, and means for rotating said screen so that as it moves from said infiuent sluice it first moves down into the liquid in said receptacle and then out into the path of said flowing means.

13. In liquid treating apparatus, the combination with a receptacle for liquid having solids in suspension, of a conveyor for removing settled solids comprising a trough having a perforated bottom, endless conveyor means including perforated flights movable over said trough, and means comprising a cover plate for squeezing material as it moves out of the liquid in said receptacle to reduce its liquid content.

WILLIAM C. MOOR.

CERTIFICATE OF ,CORRECTI 0N. Patent No. 252L631 July 20, 1915.-

WILLIAM G. HOOR.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, first column, line 5?, for "theheto" read -thereto--; line 140, strike out the word "and" and insert the same after "sluice" in line 59; e &2, for "from said influent sluice flows thereto," r a "i ai dim ntation t nk and with its-; and that the said Letters Patent should be read with this correction therein that the same may conform to the recordof the case in the Patent Office.

Signed and sealed this 9th day of May, A. D 19 -414.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

